Great cartridge.....to small in diameter for a .510 version. It would be almost totally straight walled. May give extraction troubles. Heard of it being necked up to .458 though......and most everything going down in size.

On my back burners for now is making up a classic style black powder paper patch round based on the 9.3x74R blown out to .40 or .44 caliber for a single shot 1885 rifle. I have a soft spot for the old single shot straight walled charcoal burners.